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Leases - Supplemental Cash Flow (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Leases [Abstract]    
Operating cash flows from operating leases $ 2,903  
Operating cash flows from finance leases 3,248  
Financing cash flows from finance leases 2,187 $ 946
Operating leases 0  
Finance leases $ 787